164 



THE ANIMAL PARASITES OF MAN 



usually 8 ii mm. by 1-52 mm. -The suckers are about i to of 

 the length of the body distant from each other, and of about 

 equal size (0*23 0*25 mm.). The oesophagus is hardly any longer 

 than the pharynx, which lies close behind the oral sucker ; the 



intestinal branches reach almost to the poste- 

 rior border and are often filled with blood. The 

 excretory pore is at the posterior extremity, 

 and the excretory bladder forks in front of the 

 anterior testis. The testes in the posterior 

 fourth of the body lie obliquely one behind 

 the other ; the anterior one has four lobes, 

 the posterior one five lobes ; the ovary is in 

 the median line, stretched obliquely, with 

 simple or slightly lobate border ; behind it 

 lies the large pear- or retort-shaped re- 

 ceptaculum seminis and the Laurer's canal. 

 The uterus is in the median field. The 

 vitellaria occupy the fairly broad 

 lateral areas, in about the central 

 third of the body beginning 

 behind the ventral sucker, and 

 terminating at about the level of 

 the ovary ; the acini are small 

 and arranged in groups of seven 

 to eight, separated by interstices. 

 The genital pore is close in front 

 of the ventral sucker. The eggs 

 are oval with sharply-defined 

 operculum at the pointed pole, 

 0^030 : O'Oii mm. 



This species, which is frequently confused with others, 1 inhabits the 

 gall bladder and bile ducts of the domestic cat in particular ; but is 

 also found in the dog, in the fox, and in Gulo borealis. It has been observed 

 in France, Holland, North Germany (being particularly frequent in East 

 Prussia), in Russia, Scandinavia, Siberia, Japan, Hungary, and Italy. The 

 North American form (from cats and Canis latrans} is a distinct species 

 (Opisthorchis pseudo-jelineus}. 



In man this species was first found by Winogradoff in Tomsk 

 (nine cases), then by Kholodkowsky in a peasant from the neigh- 



s' FIG. 95. Opisthorchis 

 felineus, Riv., from the 

 liver of the domestic cat. 



IO/I. 



FIG. 96. 

 Egg of Opit- 

 thorchis feli- 

 neus, Riv. 

 830/1. 



1 Braun, M., " Die Leberdistomen der Haiiskatze u. verw. Arten " (C. /. B, u. P., 1893, 

 xiv., p. 381). 



